selftests: fib_tests: Add test cases for netdev down

Check that IPv4 and IPv6 react the same when a netdev is being put
administratively down.
Signed-off-by: NIdo Schimmel <idosch@mellanox.com>
Acked-by: NDavid Ahern <dsahern@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

tools/testing/selftests/net/fib_tests.sh

@@ -120,9 +120,150 @@ fib_unreg_test()
 	fib_unreg_multipath_test
 }
 
+fib_down_unicast_test()
+{
+	ret=0
+
+	netns_create "testns"
+
+	ip netns exec testns ip link add dummy0 type dummy
+	ip netns exec testns ip link set dev dummy0 up
+
+	ip netns exec testns ip address add 198.51.100.1/24 dev dummy0
+	ip netns exec testns ip -6 address add 2001:db8:1::1/64 dev dummy0
+
+	ip netns exec testns ip route get fibmatch 198.51.100.2 &> /dev/null
+	check_err $?
+	ip netns exec testns ip -6 route get fibmatch 2001:db8:1::2 &> /dev/null
+	check_err $?
+
+	ip netns exec testns ip link set dev dummy0 down
+	check_err $?
+
+	ip netns exec testns ip route get fibmatch 198.51.100.2 &> /dev/null
+	check_fail $?
+	ip netns exec testns ip -6 route get fibmatch 2001:db8:1::2 &> /dev/null
+	check_fail $?
+
+	ip netns exec testns ip link del dev dummy0
+
+	ip netns del testns
+
+	if [ $ret -ne 0 ]; then
+		echo "FAIL: unicast route test"
+		return 1
+	fi
+	echo "PASS: unicast route test"
+}
+
+fib_down_multipath_test_do()
+{
+	local down_dev=$1
+	local up_dev=$2
+
+	ip netns exec testns ip route get fibmatch 203.0.113.1 \
+		oif $down_dev &> /dev/null
+	check_fail $?
+	ip netns exec testns ip -6 route get fibmatch 2001:db8:3::1 \
+		oif $down_dev &> /dev/null
+	check_fail $?
+
+	ip netns exec testns ip route get fibmatch 203.0.113.1 \
+		oif $up_dev &> /dev/null
+	check_err $?
+	ip netns exec testns ip -6 route get fibmatch 2001:db8:3::1 \
+		oif $up_dev &> /dev/null
+	check_err $?
+
+	ip netns exec testns ip route get fibmatch 203.0.113.1 | \
+		grep $down_dev | grep -q "dead linkdown"
+	check_err $?
+	ip netns exec testns ip -6 route get fibmatch 2001:db8:3::1 | \
+		grep $down_dev | grep -q "dead linkdown"
+	check_err $?
+
+	ip netns exec testns ip route get fibmatch 203.0.113.1 | \
+		grep $up_dev | grep -q "dead linkdown"
+	check_fail $?
+	ip netns exec testns ip -6 route get fibmatch 2001:db8:3::1 | \
+		grep $up_dev | grep -q "dead linkdown"
+	check_fail $?
+}
+
+fib_down_multipath_test()
+{
+	ret=0
+
+	netns_create "testns"
+
+	ip netns exec testns ip link add dummy0 type dummy
+	ip netns exec testns ip link set dev dummy0 up
+
+	ip netns exec testns ip link add dummy1 type dummy
+	ip netns exec testns ip link set dev dummy1 up
+
+	ip netns exec testns ip address add 198.51.100.1/24 dev dummy0
+	ip netns exec testns ip -6 address add 2001:db8:1::1/64 dev dummy0
+
+	ip netns exec testns ip address add 192.0.2.1/24 dev dummy1
+	ip netns exec testns ip -6 address add 2001:db8:2::1/64 dev dummy1
+
+	ip netns exec testns ip route add 203.0.113.0/24 \
+		nexthop via 198.51.100.2 dev dummy0 \
+		nexthop via 192.0.2.2 dev dummy1
+	ip netns exec testns ip -6 route add 2001:db8:3::/64 \
+		nexthop via 2001:db8:1::2 dev dummy0 \
+		nexthop via 2001:db8:2::2 dev dummy1
+
+	ip netns exec testns ip route get fibmatch 203.0.113.1 &> /dev/null
+	check_err $?
+	ip netns exec testns ip -6 route get fibmatch 2001:db8:3::1 &> /dev/null
+	check_err $?
+
+	ip netns exec testns ip link set dev dummy0 down
+	check_err $?
+
+	fib_down_multipath_test_do "dummy0" "dummy1"
+
+	ip netns exec testns ip link set dev dummy0 up
+	check_err $?
+	ip netns exec testns ip link set dev dummy1 down
+	check_err $?
+
+	fib_down_multipath_test_do "dummy1" "dummy0"
+
+	ip netns exec testns ip link set dev dummy0 down
+	check_err $?
+
+	ip netns exec testns ip route get fibmatch 203.0.113.1 &> /dev/null
+	check_fail $?
+	ip netns exec testns ip -6 route get fibmatch 2001:db8:3::1 &> /dev/null
+	check_fail $?
+
+	ip netns exec testns ip link del dev dummy1
+	ip netns exec testns ip link del dev dummy0
+
+	ip netns del testns
+
+	if [ $ret -ne 0 ]; then
+		echo "FAIL: multipath route test"
+		return 1
+	fi
+	echo "PASS: multipath route test"
+}
+
+fib_down_test()
+{
+	echo "Running netdev down tests"
+
+	fib_down_unicast_test
+	fib_down_multipath_test
+}
+
 fib_test()
 {
 	fib_unreg_test
+	fib_down_test
 }
 
 if [ "$(id -u)" -ne 0 ];then